Air-pump for use with condensers and the like.



I P. 1101mm. AIR PUMP FOR USE WITH GONDENSERS AND THE LIKE, APPLICATION IILED AP1.19,1909.

961,000. Patented June 7. 1910.

l l l l "by a considerably lighter and smaller pump.

I air pump.

, PHILIP FRANCIS onDIE,

PATENT OFFICE;

OF LONDON, ENGLAND.

AIR-PUMP FOR use. WITH CONDENSERS AND THE LIKE.

' p Specification of Application filed April 19,

Let er P n Patented J nne '7, 1910.

1909. Serial No. 490,887.

To all whom it maycoiicernf Be it known that I, Pmnrr Fnaxcls Onnre, a subject of the King of Great Britain and Ireland, and resident of London, England, have invented new and useful Improvements in Air-Pumps for Use with Condensers and the Like, of which the fol lowing is a specification.

This invention relates to Mt pumps for use with condensers and the like, and refers to that class of pump known as the .triple valve type with foot, bucket and head valves, and has for its object to increasethe total volume of air, drawn in and discharged at each double stroke, thus enablingeither a given sized pump to perform-more work, or a given amount ofworkto be performed Hitherto, in pumps of this class, no air is drawn into the pumpon the down stroke the air, vapor and water which have been. drawn into the pump during the preceding up stroke, merely passing through the bucketvalves into the pump cylinder above the bucket, to be discharged through the headvalves on the next upstroke. Inmy improved air pump howc\'er, air and vapor are also drawn in for a considerable pcrlod of the down stroke. 1

Referring to the drawings: Figure l is a longitudinal section through the lmproved Fig. 2 shows an indicator diagram taken from abovethe'pistou. Fig. 3 shows an indicator diagram taken from below the piston.

' bucket. In contradistinction tothe liiicket valves, the additional suction valve orvalves is or are made to open with the least possible resistance.

-In operation, as the bucket ascends there is a diminution of pressure in the air pump cylinder between the bucket and the foot valves, which therefore open, air, vapor and water being" drawn in from the suction chamber inthe usual way, while the conthrough the head valves, also in the usual way. As the bucketdescends, there is a diminution of pressurehetween the head -\-'alves and the bucket and an increase of pressure between the bucket valves and the foot valves. In the ordinary pump 'of this type this increase of pressure below the bucket causes the bucket valves to open directly after the commencement of the down stroke. Inmy invention however, the valves being loadc(l,/tl1isppening of the .bucket valves is delayed till the contents below the bucket have been sufficiently com ressedto overcome the resistance of the loa ed valves. A very slight diminution of pressure above the bucket causes the additional suction valve controllingthe channel connectin the suction chamber witli the upper part 0 the air pump cylinder, to open at once, and air .is drawn from the suction chamber or the condenser to the upper part of the barrel. This continues until the fluid is so far comressed under. the bucket as to open the )ucket valves, and with pumps for high I vacua' and with valves loaded with the pres- In car ing out my invention I make use of a bndli et (1, provided with valves 1) in the ordinary way, and working in a cylinder 0. These valves however are loaded with springs (l or otherwise, so that a certain alnoiint of resistance is necessary tocause them to open. I prefer to make these springs of sucu a strength that they will not open until they are acted on by a pressure equal to one third or one half of the atlnospheric'pressure acting 'on the area of the valve underneath.- The foot or suction valves 0, on the contrary,are made extremely light, and open with the least )ossible resistance. In addition to these oot or suction valvcs comimmieatiug with the space below the bucket, I provide one or more additional suction valves f controlling a sure mentioned above, this would take place after about three quarters of the down stroke has been accomplished. As soon as the bucket valves open on the down stroke, the additional suction valve naturally closes, and the air, vapor and water below the bucket are discharged through the bucket valves into the space above the bucket, and this quantity, together with. the air, vapor and water'drawn in on the down stroke through the additional suction valve is discharged on the up stroke throughthe head valves. The displacement of the pump is thus considerably increased. The displacement per double stroke in the three valve type of air pump as hitherto constructed can never be more than the area of the piston multiplied by the length of stroke, while in the impassage 9 leading from the suction chamber to that part of the barrel that IS above the proved type, the dispia-': '-ment per double tents above the bucket are being discharged "st roke isthe area by the len h p r k P 1311 1n the o pum wo improved per double stroke is re resentedbym plus 3 2 being the point w en the bucketrvalves commence to open, Figs.

2 and 3., The displacement of the pump l will increase as the vacuum increases since the bucket valves will open later with higher vacua, and the suction valve will ,be open lsiion'alonger period. On the other hand 's'liould a. sudden inflow of water enter the .pump,n0 difiiculty or disturbance will occur 7 channel, and a piston rovided withspring asfthe bucket valves will open at any art of the stroke as soon as thepredetermmed prgsspre is i-aised,allowin the water to pass to thejo'ther .side of the bucket. Thus the known advantages of the ordina threev valve air. pump are maintained, w ile securing'nearly 'doublethe capacity. The channel Fmay either be connectedas shown ""on drawing, with the main suction inlet, or

itjma'yibe connected to the upper art of the condenser, 50 jthat air is drawn from the coole stfpart through an auxiliary suction va ve'into the uppe'r'part of the pump, while v s rew-multiplied by} at poart of jthe downfstrokethat is aecomphshed. are the; bucket valves open. In other vapor and water are drawn through the .foot va ves.

1. In an air pum the combinationeof a cylinder having hea valves and fo'otyalves and provided with achannel connecting the ufpperpart of the cylinder with the suction amber of the pump, a: suction valve iii-saidchannel, and a piston rovided with loaded bucket valves arranged valve, substantially as described.

2. In an air pum the combination of a cylinder having hea valves and foot valves and provided with a channel connecting the ulpper part of the cylinder with the suction c to offer a,- eater re- 40 sistance to opening than does t e suction amber of the vpump, a suction valve in said loaded bucket valves,t e loadv on. said bucket valves bein such that the suction-.valve opens with at less resistance than the bucket valves, subs'tantiallyaedesorib In testimony, that I claim the foregoing as my invention, I have -signed my name in April 1909.

Witnesses;

H. .D. Jameson, F. L. RAND.

presence of two witnesses,,thiss1xth"day-'of v LIP 'FRANCIS'TODDIE; 

